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Reducing the environmental footprint of wastewater screenings through anaerobic digestion with resource recovery

Cadavid-Rodriguez, LS and Horan, NJ (2012) Reducing the environmental footprint of wastewater screenings through anaerobic digestion with resource recovery. Water and Environment Journal. ISSN 1747-6585 (In Press)

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Abstract

Screenings produced as the first stage of wastewater treatment and currently disposed of to landfill, are rich in volatile organic solids, nitrogen and phos- phorus which could be recovered through anaerobic digestion. Biochemical methane potential (BMP) tests on screenings demonstrated a methane yield of 0.33 m3 methane/kg volatile solids (VS) and a VS destruction of 50%. Con- sequently, the effect of a range of hydraulic retention time (HRT) and organic loading rates (OLRs) was evaluated in lab-scale continuously fed mesophilic digesters. The highest methane yield of 0.416 Nm3 methane/kg VS added was observed with an HRT of 15 days and an OLR of 2.5 kg VS/m3/day, when up to 65% of the VS were destroyed. If treated by anaerobic digestion, every dry tonne of screenings digested would divert 466 kg from landfill, save 4.6 tonne equivalent carbon dioxide (CO2 eq) and deliver 3.4 MWh of renewable energy.

Item Type: Article
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 04 Jan 2012 13:29
Last Modified: 15 Sep 2014 03:47
Published Version: http://dx.doi.org/10.1111/j.1747-6593.2011.00289.x
Status: In Press
Publisher: Chartered Institution of Water and Environmental Management
Identification Number: 10.1111/j.1747-6593.2011.00289.x
URI: http://eprints.whiterose.ac.uk/id/eprint/43569

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